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Time-of-flight mass spectrometry equipment for high-resolution and high-sensitivity determination of VOCs content and method

A time-of-flight mass spectrometry and high-sensitivity technology, applied in the field of time-of-flight mass spectrometry equipment for high-resolution and high-sensitivity determination of VOCs content, can solve problems such as resolution, low sensitivity, water vapor reaction, and narrow range of molecular weight determination

Pending Publication Date: 2021-01-08
肖洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The detection speed of the above-mentioned equipment and method is fast, but there are many problems: most of the PTR reaction gases currently use water vapor as the reaction gas, while other reaction gases are not involved, and water vapor cannot react with organic molecules whose proton affinity is smaller than water, resulting in The detection range is limited, and different reactive gases cannot achieve better switching
In addition, the traditional electrostatic quadrupole focusing separation is used, the charged ions are easily lost, there is mass discrimination, the determination of molecular weight is narrow, the resolution and sensitivity are low, and the detection limit is high.

Method used

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  • Time-of-flight mass spectrometry equipment for high-resolution and high-sensitivity determination of VOCs content and method
  • Time-of-flight mass spectrometry equipment for high-resolution and high-sensitivity determination of VOCs content and method
  • Time-of-flight mass spectrometry equipment for high-resolution and high-sensitivity determination of VOCs content and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The samples containing propylene, benzene, toluene, styrene and acetone were measured with water vapor as the reactive gas.

[0063] Time-of-flight mass spectrometry equipment used for high-resolution and high-sensitivity determination of VOCs content, such as figure 1 As shown, it includes a reaction chamber, the reaction chamber is provided with a reaction gas inlet 58, the reaction gas inlet 58 is connected to the outlet of the first three-way 8, and the two inlets of the first three-way 8 are respectively connected to the water vapor generating equipment and other reaction gas inlets 6 , the reaction chamber includes successively adjacent ion source glow discharge region 11, ion source drift region 12, first differential vacuum chamber 13 and reaction tube 14, and the rear of the reaction chamber is sequentially connected with second differential vacuum chamber 15 and ion transport region 16 and the TOF detection area 18, the first differential vacuum chamber 13 and...

Embodiment 2

[0100] The samples containing propylene, benzene, toluene, styrene, acetone and methyl tert-butyl ether were determined with oxygen as the reactive gas.

[0101] The reaction time-of-flight mass spectrometry equipment used for the determination of VOCs content with high resolution and high sensitivity, such as figure 1 As shown, it includes a reaction chamber, the reaction chamber is provided with a reaction gas inlet 58, the reaction gas inlet 58 is connected to the outlet of the first three-way 8, and the two inlets of the first three-way 8 are respectively connected to the water vapor generating equipment and other reaction gas inlets 6 , the reaction chamber includes successively adjacent ion source glow discharge region 11, ion source drift region 12, first differential vacuum chamber 13 and reaction tube 14, and the rear of the reaction chamber is sequentially connected with second differential vacuum chamber 15 and ion transport region 16 and the TOF detection area 18, ...

Embodiment 3

[0120] The samples of propylene, benzene, toluene and styrene were determined with nitric oxide as the reaction gas.

[0121] Time-of-flight mass spectrometry equipment used for high-resolution and high-sensitivity determination of VOCs content, such as figure 1 As shown, it includes a reaction chamber, the reaction chamber is provided with a reaction gas inlet 58, the reaction gas inlet 58 is connected to the outlet of the first three-way 8, and the two inlets of the first three-way 8 are respectively connected to the water vapor generating equipment and other reaction gas inlets 6 , the reaction chamber includes successively adjacent ion source glow discharge region 11, ion source drift region 12, first differential vacuum chamber 13 and reaction tube 14, and the rear of the reaction chamber is sequentially connected with second differential vacuum chamber 15 and ion transport region 16 and the TOF detection area 18, the first differential vacuum chamber 13 and the reaction ...

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Abstract

The invention relates to an analysis and detection instrument, in particular to time-of-flight mass spectrometry equipment for high-resolution and high-sensitivity determination of VOCs content and method The equipment comprises a reaction chamber; the reaction chamber is connected with water vapor generation equipment and other reaction gas inlets; the reaction chamber comprises an ion source glow discharge area, an ion source drift area, a first differential vacuum cavity and a reaction tube which are sequentially adjacent to each other; the rear portion of the reaction chamber is sequentially connected with a second differential vacuum cavity, an ion transmission area and a TOF detection area; a single lens is arranged in the ion transmission area; the single lens consists of three groups of electrodes which are arranged in a left-right direction; an accelerating electric field area on the upper portion of the TOF detection area is communicated with the reflection area through a field-free drift area; an XY deflection plate is arranged in the field-free drift area; and three groups of reflectors and detectors are arranged in the reflection area. Volatile organic compounds detected by the equipment and method are wide in variety; the equipment and method are high in resolution and sensitivity; the detection of a nucleo plasmic ratio of 0.0000X can be realized; few interference factors exist in a detection process; few fragments are generated; and easiness in analysis is realized.

Description

technical field [0001] The invention relates to an analysis and detection instrument, in particular to a time-of-flight mass spectrometry device and method for measuring VOCs content with high resolution and high sensitivity. Background technique [0002] With the promulgation of the national "Ten Gas Measures", the determination of volatile organic compounds in the air and exhaust gas has become the key content of atmospheric monitoring. In order to obtain real-time emissions of VOCs from enterprises or the content of VOCs in the ambient air of emergencies, online monitoring methods have been widely used. . At present, the VOCs online monitoring methods that are widely used mostly use gas chromatography tandem mass spectrometry or directly use FID detectors for detection. These detection methods can realize the analysis of ambient air and gases collected from fixed pollution sources, but there are many disadvantages: the detection process It needs to be pretreated and sepa...

Claims

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Application Information

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IPC IPC(8): G01N27/68H01J49/40
CPCG01N27/68H01J49/40
Inventor 王新娟肖洋王琛
Owner 肖洋